JPS6027682Y2 - front hub device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a motorcycle front bub device.

Traditionally, the front disc brake of a motorcycle is
As shown in the figure, the front axle 1 has a pole bearing 2.
The inner circumferential edge of a dish-shaped annular disc holder 5 with an annular brake disk 4 attached to the outer circumferential edge is fixed to the side surface of the bub 3 which is supported via a bolt 6, or a recess having the necessary braking surface. The shaped discs are fixed with bolts 6, and both sides of each brake disc 4 are sandwiched and pressed between friction butts 7.

By the way, about this front disc brake.

The brake disc 4 requires a special caulking 8 to be attached to the outer peripheral edge of the disk-shaped annular disc holder 5, and the brake disc 4 and the mounting surface 5a of the disc holder 5 to the bub 3 are made parallel to each other. This is difficult due to production technology, and even if it were possible to make it parallel, the mounting surface 3a of the disc holder 5 of the bubble 3 would be close to the front wheel 9.
If the brake disc 4 and the front wheel 9 are not formed parallel to each other, the brake disc 4 and the front wheel 9 will not be parallel to each other, resulting in a lateral vibration phenomenon of the brake disc 4.

When the brake disc 4 is assembled to the wheel, the lateral runout of the brake disc 4 is generally required to be 0.2 or less for motorcycles, and if the lateral runout of the combination of the brake disc 4 and the front wheel 9 exceeds this value, the motorcycle Abnormal lateral vibration occurs in the brake disc 4 as the front wheel 9 rotates during driving, and when the brake is applied, the friction butt 7 moves left and right as the brake disc 4 laterally oscillates.

Therefore, the lever force applied to the mask cylinder will fluctuate, and there is a risk that stable braking will be impaired.

Further, in the case of a brake disc having a concave shape, distortion occurs due to heat generation during braking, which also causes lateral vibration of the brake disc.

Furthermore, as mentioned above, in a disc brake having a disc holder, it is difficult due to production technology to make the brake disc 4 and the mounting surface 5a of the disc holder 5 parallel to the bub 3, and the brake disc 4 is not attached to the outside of the disc holder 5. There are difficulties in manufacturing disc brakes, such as the fact that they must be attached with special crimps 8 on the periphery.

Furthermore, a conventional speedometer drive device 10, which is provided at one end of the front axle 1 as shown in FIG.
rotates, and the cylindrical receiver 11 is fixed to the knob 3.
The rotational force is transmitted to the cable 14 via the gear 12 engaged with the receiver 11 and the pinion 13 engaged with the gear 12, and the cable 14 is rotated at a speed corresponding to the rotational speed of the front wheel 9. and the speedometer (
(not shown).

However, the receiver 11 in this speedometer drive device 10 is fixed to the bub 3 (in some cases, it is fixed to the gear 12 and engaged with the bub 3.

), so when starting the motorcycle, braking, or suddenly changing gears, the receiver 1
The engaging portion between the gear 1 and the gear 12 may receive an impact, and as a result, the retaining portion may be damaged.

Furthermore, since the receiver 11 is fixed to the front wheel 9, the center of the receiver 11 does not coincide with the inner circumferential surface of the gear case 15, so that the oil seal 16 attached to the inner circumferential surface of the receiver 11 and the gear case 15 It is difficult to maintain uniform contact over the entire circumference.

This results in accelerated wear of the oil seal 16, and there have been cases where dust has entered the inside of the gear case 15.

The present invention was devised in view of the above circumstances, and is designed to hold the brake disc of a front disc brake and the front wheel in parallel to prevent the brake disc from wobbling laterally, to facilitate assembly, and to provide a speedometer drive device. It is an object of the present invention to provide a front bub device which prevents a retaining part between a receiver and a gear from being subjected to impact and also prevents dust from entering the inside of a gear case.

Hereinafter, an embodiment of the front bub device according to the present invention will be described with reference to FIG. A second boss 9b is provided concentrically and spaced apart by a plurality of ribs on the outer circumferential side of the second boss 9a, and both side surfaces of the second boss 9b are vertical surfaces, and a constant interval is spaced between the two side surfaces in the circumferential direction. A screw hole 20 for fixing the brake disc is provided, and a flat annular brake disc 4' is applied to both vertical sides of the second boss 9b. It is fixed by screwing an Allen bolt 21.

A collar 23 is fitted and tightened between the inner race of the ball bearing 2 on the front axle 1 and the front fork 22, and a bottomless cup-shaped gear case 15 is fitted and fixed onto the collar 23. ing.

In this gear case 15, a gear 12 of a speedometer drive device is rotatably supported on a collar 23, and the gear 12 is connected to a speedometer cable 14 in a direction perpendicular to the front axle 1, and is rotated by the gear case 1.5. The freely supported vinyl ons 13 are engaged.

An oil seal 16 is provided on the inner peripheral surface of the opening of the gear case 15.
A cylindrical receiver 11' having a flange 25 is held on the inner peripheral surface of the oil seal 16 and is spaced apart from the collar 23.

At the end of the receiver 11' opposite to the flange 25, a pair of rectangular recesses 26 as shown in FIG. A rectangular protrusion 27 that extends integrally with the plate is engaged with the protrusion 27 .

A groove 28 is provided in the axial direction in a part of the outer circumferential side of the outer race of the ball bearing 2, and a groove 28 is provided in the groove 28 so as to protrude in the axial direction on a part of the outer circumferential edge of the flange 25 of the receiver 11'. The protrusions 29 provided are engaged to allow the receiver 11' to float.

The ball bearing 2 is covered with the flange 25, and the protrusion 2 of the receiver 11' is placed on the outside of the flange 25.
9 from the groove 28, a circlip 3 is provided on the inner peripheral side of the end m of the first boss 9a of the front wheel 9.
0 is attached.

In the front bub device of the present invention configured as described above, both sides of the second boss 9b of the front wheel 9 have screw holes 20 for fixing brake discs provided on both left and right sides of the second boss 9b, that is, the front wheel. Since the flat annular brake disc 4' is attached directly to both vertical sides obtained by lathing parallel to the vertical center line of the wheel 9, the brake disc 4' and the front wheel 9 can be adjusted within the above-mentioned values. can be maintained at a parallelism of .

Therefore, when the motorcycle is running, the brake disc 4' does not sway horizontally, and when the brake is applied, the friction pad 7 presses evenly on both sides of the brake disc 4'. The friction pad 7 is not dragged due to the inclination of the brake, and stable braking can be performed without causing any abnormal noise or damage to the disc brake.

Further, the brake disc 4' does not need to be attached to the outer circumferential edge of the disc holder 5 with a special caulking 8 as in the conventional case, and can be easily attached directly to the front wheel 9 in parallel, making assembly of the disc brake easy.

Further, in the front bub device of the present invention, the receiver 11' in the speedometer drive device 10 is connected to the gear case 1.
It is held on the inner peripheral surface of an oil seal 16 attached to the inner peripheral surface of the opening of the gear 12, and is connected to the gear 12 by engagement with a recess 26 and a protrusion 27, and similarly connected to the front wheel 9 by a protrusion 29 and a groove 28. The receiver 11' and gear 1 can be connected and floated by engaging with the receiver 11' and gear 1 when starting the motorcycle, braking, sudden gear changes, etc.
2 will not receive direct impact.

The impact force is generally expressed as F = m (v - v,), but in the front bub device of the present invention, the time for the impact force to act is as long as possible, so that it is possible to convert the so-called impact force into a static force. This is to improve the durability of the gear 12 by bringing it as close as possible.

Now, when we analyze the driving force of gear 12, Ten FI to F FR=F becomes.

F: Driving force finally applied to the gear 12 FK: Rotational force of the front wheel 9 Fi: Impact force FR Considering the resistance FK of the oil seal 16 as a force majeure, reducing the impact force on the gear 12 will improve durability. Become.

The front bub device of the present invention embodies this, and receives impact using the groove 28 of the front wheel 9 and the protrusion 29 of the receiver 11', and further uses the gap between the engagement part of the receiver 11' and the gear 12 to receive the impact. The time to receive the impact is extended, and the resistance F of the oil seal 16 is increased.

By further absorbing the impact force, the static driving force is smoothly transmitted to the gear 12, and the connecting portion between the gear 12 and the receiver is not damaged.

Also, by making the receiver 11' floating,
Since the center of the receiver 11' can be aligned with the center of the inner peripheral surface of the gear case 15, the gear case 11'
The contact with the oil seal 16 attached to the inner peripheral surface of the gear case 1 can be maintained uniformly over the entire circumference.
Dust does not enter into the interior of the oil seal 16, and the life of the oil seal 16 is extended.

Furthermore, the flange 25 of the receiver 11' covers the ball bearing 2, and the circlip 30 closes the gap between the 7 langes 25 and the inner circumferential surface of the first boss 9a of the front wheel 9, so that there is no leakage into the first boss 9a. This has the effect of preventing dust from entering.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional front bubble device, FIG. 2 is a longitudinal sectional view of a front bubble device according to this study committee, and FIG. 3 is a view taken along the line A--A in FIG. 2. 1...Front axle, 2...Ball bearing, 4'...Brake disc, 7
...Friction pad, 9...Front wheel, 9a...1st boss, 9b...2nd boss, 10...speedometer drive device,
11'...Receiver-112...Gear, 13...Zenion, 14...Cable, 15...Gear case, 16... ...
Oil seal, 20...Screw hole, 21...
...Bolt, 22...Front fork, 23
...Color, 25...Flange, 26
...... Rectangular recess, 27... Rectangular protrusion, 28... Groove, 29... Protrusion, 30.
・Song circlip.

Claims (1)

[Scope of utility model registration request] On the outer peripheral side of the first boss of the front wheel supported by the first boss on the front axle via a bearing,
A second boss is provided concentrically and spaced apart by a plurality of ribs,
Both sides of the second boss are vertical surfaces, and a flat annular brake disc is directly fixed to both vertical sides, and a collar is attached to the outer periphery of the collar which is tightened and fixed between the bearing on the front axle and the front fork. A bottomless cup-shaped gear case is fitted and fixed, a gear is rotatably supported on a collar within this gear case, and a pinion connected to the speedometer cable in a direction perpendicular to the front axle is engaged with the gear. A cylindrical receiver having a flange is held on the inner circumferential surface of an oil seal attached to the inner circumferential surface of the opening of the oil seal, and the receiver and the gear are connected to a rectangular recess provided at the end of the receiver. It engages with a rectangular protrusion that extends axially from the side of the gear, and the axial protrusion that is provided on the outer periphery of the receiver flange is inserted into the groove that is provided on a part of the outer periphery of the bearing of the front bubble. A front bub device comprising a circlip which is engaged with the circlip to enable the receiver to float, and which is provided on the inner circumferential surface of the end of the front bub to suppress the movement of seven flange of the receiver in the axial direction.